Article V — Provisions For Flood Hazard Reduction

If a proposed building site is in a flood-prone area, all new construction and substantial improvements, including manufactured homes, shall:

• A. Be designed (or modified) and adequately anchored to prevent flotation, collapse, or lateral movement of the structure resulting from hydrodynamic and hydrostatic loads, including the effects of buoyancy.

• B. Be constructed:

  1. With materials and utility equipment resistant to flood damage;

  2. Using methods and practices that minimize flood damage;

3. With electrical, heating, ventilation, plumbing and air conditioning equipment and other service facilities that are designed and/or located so as to prevent water from entering or accumulating within the components during conditions of flooding.

(Ord. 16-05 § 1, 2016; Ord. 20-02 § 1, 2020; Ord. 21-06 § 1, 2021)

If a subdivision proposal or other proposed new development, including manufactured home parks or subdivisions, is in a flood-prone area, any such proposals shall be reviewed to assure that:

• A. All such proposals are consistent with the need to minimize flood damage within the floodprone area;

• B. All public utilities and facilities such as sewer, gas, electrical, and water systems are located and constructed to minimize or eliminate flood damage; and

• C. Adequate drainage is provided to reduce exposure to flood hazards.

• D. In addition to the requirements of this section, where any portion of proposed subdivisions, including proposals for manufactured home parks and subdivisions, lies within a flood hazard area, the following shall be required:

  1. The flood hazard area shall be delineated on preliminary subdivision plats.

  2. Where the subdivision has more than 50 lots or is larger than five acres and base flood elevations are not included on the FIRM, the base flood elevations shall be determined by the floodplain administrator in accordance with this chapter at the expense of the proposer of the subdivision.

  3. When, as part of a proposed subdivision, fill will be placed to support buildings, the fill shall be placed in accordance with the building code and approval of the subdivision shall require submission of as-built elevations for each filled pad certified by a licensed land surveyor or registered civil engineer.

• (Ord. 16-05 § 1, 2016; Ord. 20-02 § 1, 2020; Ord. 21-06 § 1, 2021; Ord. 23-03 § 3, 2023)

• A. All new and replacement water supply and sanitary sewage systems shall be designed to minimize or eliminate:

  1. Infiltration of flood waters into the systems; and

  2. Discharge from the systems into flood waters.

• B. On-site waste disposal systems shall be located to avoid impairment to them, or contamination from them during flooding.

• (Ord. 16-05 § 1, 2016; Ord. 20-02 § 1, 2020; Ord. 21-06 § 1, 2021)

Until a regulated floodway is adopted, no new construction, substantial development, or other development (including infill) shall be permitted within Zone A unless it is demonstrated that the cumulative effect of the proposed development, when combined with all other development, will not increase the water surface elevation of the base flood more than one foot at any point within the lands under the jurisdiction of the city of Hughson.

(Ord. 20-02 § 1, 2020; Ord. 21-06 § 1, 2021)